Plastics & Processes Flashcards
What’s advantages of plastics and elastomers?
Low cost, Versatile and Transparent
What’s disadvantages of plastics
And elastomers?
Polluting
Manufacturer is polluting
What’s are thermoplastics?
Plastics which can be heated and shaped many times
Examples of thermoplastics?
ABS
Acrylic
Nylon
Polypropylene
Polyethene
What are thermosetting plastics?
Plastics which can be heated and shaped only once
Examples of thermosetting plastics?
Urea Formaldehyde
Melamine Formaldehyde
What are elastomers?
Plastics which are rubbery and springy
Can be thermoplastics or thermosetting
Examples of elastomers?
Rubber
Silicon Rubber
Neoprene
Explain Additives?
Mixed in with plastics to improve properties ex last longer, easier to work, more colourful
Explain Fillers?
Added to plastics to bulk them out and reduce the amount of polymer being used
What are common additives?
Colouring
UV stabilizers
Lubricants
Flame retardants
What are common fillers?
Glass beads
Metal powder
Sawdust
Ceramic powder
What are sheet processes?
Vaccum forming
Laser cutting
Line bending
Blanking and piercing
Press forming
What’s line bending used to make?
Riot shields
Acrylic lecterns
Covid screens
Identifying features of vaccum forming?
Open
Large draft angles
Large round corners
What’s identifying features of laser cutting?
Thin sheets
High accuracy
Burn marks on wood
What’s identifying features of line bending?
Straight line bends
Distortion at corners
What’s identifying features of blanking and piercing?
Very accurate
What’s identifying techniques of press forming?
Thin sheet material
Rounded corners
Good surface texture
What would you use injection moulding to make?
Toys
Storage tubs
Chairs
What would you use compression moulding to make?
Wellies
Safety hats
Shoe grips
What would you use blow moulding to make?
Bottles
Containers
Medical vessels
What’s identifying features of blow moulding?
Hollow containers
No interior detailing
Constant wall thickness
What would you use extrusion to make?
Window frames
Pipes
Beams
What’s identifying features of extrusion?
Long thin objects
Complex cross section
